MD Settings: Add mouse settings, update pointer settings

chrome/browser/ui/webui/settings/chromeos/device_pointer_handler.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_WEBUI_SETTINGS_CHROMEOS_DEVICE_POINTER_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_SETTINGS_CHROMEOS_DEVICE_POINTER_HANDLER_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "chrome/browser/chromeos/system/pointer_device_observer.h"
+#include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace chromeos {
+namespace settings {
+
+// Chrome OS "Mouse and touchpad" settings page UI handler.
+class PointerHandler
+    : public ::settings::SettingsPageUIHandler,
+      public chromeos::system::PointerDeviceObserver::Observer {
+ public:
+  PointerHandler();
+  ~PointerHandler() override;
+
+  // SettingsPageUIHandler implementation.
+  void RegisterMessages() override;
+  void OnJavascriptAllowed() override;
+  void OnJavascriptDisallowed() override;
+
+ private:
+  // PointerDeviceObserver implementation.
+  void TouchpadExists(bool exists) override;
+  void MouseExists(bool exists) override;
+
+  // Initializes the page with the current pointer information.
+  void HandleInitialize(const base::ListValue* args);
+
+  std::unique_ptr<chromeos::system::PointerDeviceObserver>
+      pointer_device_observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(PointerHandler);
+};
+
+}  // namespace settings
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_CHROMEOS_DEVICE_POINTER_HANDLER_H_